The word means “government by the worst people.” The plural form is kakistocracies.The earliest evidence for its use comes from 1644, when it was used by Paul Gosnold to warn about transforming “our well-temperd Monarchy into a mad kinde of Kakistocracy.” Following this the word had a period of relative inactivity, and reappeared in the early 19th century.

John O. Brennan Retweeted Donald J. Trump
Your kakistocracy is collapsing after its lamentable journey. As the greatest Nation history has known, we have the opportunity to emerge from this nightmare stronger & more committed to ensuring a better life for all Americans, including those you have so tragically deceived.